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edac_device_sysfs.c

/*
 * file for managing the edac_device class of devices for EDAC
 *
 * (C) 2007 SoftwareBitMaker (http://www.softwarebitmaker.com)
 *
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written Doug Thompson <norsk5@xmission.com>
 *
 */

#include <linux/ctype.h>
#include <linux/module.h>

#include "edac_core.h"
#include "edac_module.h"

#define EDAC_DEVICE_SYMLINK   "device"

#define to_edacdev(k) container_of(k, struct edac_device_ctl_info, kobj)
#define to_edacdev_attr(a) container_of(a, struct edacdev_attribute, attr)


/*
 * Set of edac_device_ctl_info attribute store/show functions
 */

/* 'log_ue' */
static ssize_t edac_device_ctl_log_ue_show(struct edac_device_ctl_info
                              *ctl_info, char *data)
{
      return sprintf(data, "%u\n", ctl_info->log_ue);
}

static ssize_t edac_device_ctl_log_ue_store(struct edac_device_ctl_info
                              *ctl_info, const char *data,
                              size_t count)
{
      /* if parameter is zero, turn off flag, if non-zero turn on flag */
      ctl_info->log_ue = (simple_strtoul(data, NULL, 0) != 0);

      return count;
}

/* 'log_ce' */
static ssize_t edac_device_ctl_log_ce_show(struct edac_device_ctl_info
                              *ctl_info, char *data)
{
      return sprintf(data, "%u\n", ctl_info->log_ce);
}

static ssize_t edac_device_ctl_log_ce_store(struct edac_device_ctl_info
                              *ctl_info, const char *data,
                              size_t count)
{
      /* if parameter is zero, turn off flag, if non-zero turn on flag */
      ctl_info->log_ce = (simple_strtoul(data, NULL, 0) != 0);

      return count;
}

/* 'panic_on_ue' */
static ssize_t edac_device_ctl_panic_on_ue_show(struct edac_device_ctl_info
                                    *ctl_info, char *data)
{
      return sprintf(data, "%u\n", ctl_info->panic_on_ue);
}

static ssize_t edac_device_ctl_panic_on_ue_store(struct edac_device_ctl_info
                                     *ctl_info, const char *data,
                                     size_t count)
{
      /* if parameter is zero, turn off flag, if non-zero turn on flag */
      ctl_info->panic_on_ue = (simple_strtoul(data, NULL, 0) != 0);

      return count;
}

/* 'poll_msec' show and store functions*/
static ssize_t edac_device_ctl_poll_msec_show(struct edac_device_ctl_info
                              *ctl_info, char *data)
{
      return sprintf(data, "%u\n", ctl_info->poll_msec);
}

static ssize_t edac_device_ctl_poll_msec_store(struct edac_device_ctl_info
                              *ctl_info, const char *data,
                              size_t count)
{
      unsigned long value;

      /* get the value and enforce that it is non-zero, must be at least
       * one millisecond for the delay period, between scans
       * Then cancel last outstanding delay for the work request
       * and set a new one.
       */
      value = simple_strtoul(data, NULL, 0);
      edac_device_reset_delay_period(ctl_info, value);

      return count;
}

/* edac_device_ctl_info specific attribute structure */
struct ctl_info_attribute {
      struct attribute attr;
      ssize_t(*show) (struct edac_device_ctl_info *, char *);
      ssize_t(*store) (struct edac_device_ctl_info *, const char *, size_t);
};

#define to_ctl_info(k) container_of(k, struct edac_device_ctl_info, kobj)
#define to_ctl_info_attr(a) container_of(a,struct ctl_info_attribute,attr)

/* Function to 'show' fields from the edac_dev 'ctl_info' structure */
static ssize_t edac_dev_ctl_info_show(struct kobject *kobj,
                        struct attribute *attr, char *buffer)
{
      struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
      struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);

      if (ctl_info_attr->show)
            return ctl_info_attr->show(edac_dev, buffer);
      return -EIO;
}

/* Function to 'store' fields into the edac_dev 'ctl_info' structure */
static ssize_t edac_dev_ctl_info_store(struct kobject *kobj,
                        struct attribute *attr,
                        const char *buffer, size_t count)
{
      struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
      struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);

      if (ctl_info_attr->store)
            return ctl_info_attr->store(edac_dev, buffer, count);
      return -EIO;
}

/* edac_dev file operations for an 'ctl_info' */
static struct sysfs_ops device_ctl_info_ops = {
      .show = edac_dev_ctl_info_show,
      .store = edac_dev_ctl_info_store
};

#define CTL_INFO_ATTR(_name,_mode,_show,_store)        \
static struct ctl_info_attribute attr_ctl_info_##_name = {      \
      .attr = {.name = __stringify(_name), .mode = _mode },   \
      .show   = _show,                                        \
      .store  = _store,                                       \
};

/* Declare the various ctl_info attributes here and their respective ops */
CTL_INFO_ATTR(log_ue, S_IRUGO | S_IWUSR,
      edac_device_ctl_log_ue_show, edac_device_ctl_log_ue_store);
CTL_INFO_ATTR(log_ce, S_IRUGO | S_IWUSR,
      edac_device_ctl_log_ce_show, edac_device_ctl_log_ce_store);
CTL_INFO_ATTR(panic_on_ue, S_IRUGO | S_IWUSR,
      edac_device_ctl_panic_on_ue_show,
      edac_device_ctl_panic_on_ue_store);
CTL_INFO_ATTR(poll_msec, S_IRUGO | S_IWUSR,
      edac_device_ctl_poll_msec_show, edac_device_ctl_poll_msec_store);

/* Base Attributes of the EDAC_DEVICE ECC object */
static struct ctl_info_attribute *device_ctrl_attr[] = {
      &attr_ctl_info_panic_on_ue,
      &attr_ctl_info_log_ue,
      &attr_ctl_info_log_ce,
      &attr_ctl_info_poll_msec,
      NULL,
};

/*
 * edac_device_ctrl_master_release
 *
 *    called when the reference count for the 'main' kobj
 *    for a edac_device control struct reaches zero
 *
 *    Reference count model:
 *          One 'main' kobject for each control structure allocated.
 *          That main kobj is initially set to one AND
 *          the reference count for the EDAC 'core' module is
 *          bumped by one, thus added 'keep in memory' dependency.
 *
 *          Each new internal kobj (in instances and blocks) then
 *          bumps the 'main' kobject.
 *
 *          When they are released their release functions decrement
 *          the 'main' kobj.
 *
 *          When the main kobj reaches zero (0) then THIS function
 *          is called which then decrements the EDAC 'core' module.
 *          When the module reference count reaches zero then the
 *          module no longer has dependency on keeping the release
 *          function code in memory and module can be unloaded.
 *
 *          This will support several control objects as well, each
 *          with its own 'main' kobj.
 */
static void edac_device_ctrl_master_release(struct kobject *kobj)
{
      struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);

      debugf4("%s() control index=%d\n", __func__, edac_dev->dev_idx);

      /* decrement the EDAC CORE module ref count */
      module_put(edac_dev->owner);

      /* free the control struct containing the 'main' kobj
       * passed in to this routine
       */
      kfree(edac_dev);
}

/* ktype for the main (master) kobject */
static struct kobj_type ktype_device_ctrl = {
      .release = edac_device_ctrl_master_release,
      .sysfs_ops = &device_ctl_info_ops,
      .default_attrs = (struct attribute **)device_ctrl_attr,
};

/*
 * edac_device_register_sysfs_main_kobj
 *
 *    perform the high level setup for the new edac_device instance
 *
 * Return:  0 SUCCESS
 *         !0 FAILURE
 */
int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
{
      struct sysdev_class *edac_class;
      int err;

      debugf1("%s()\n", __func__);

      /* get the /sys/devices/system/edac reference */
      edac_class = edac_get_edac_class();
      if (edac_class == NULL) {
            debugf1("%s() no edac_class error\n", __func__);
            err = -ENODEV;
            goto err_out;
      }

      /* Point to the 'edac_class' this instance 'reports' to */
      edac_dev->edac_class = edac_class;

      /* Init the devices's kobject */
      memset(&edac_dev->kobj, 0, sizeof(struct kobject));
      edac_dev->kobj.ktype = &ktype_device_ctrl;

      /* set this new device under the edac_class kobject */
      edac_dev->kobj.parent = &edac_class->kset.kobj;

      /* generate sysfs "..../edac/<name>"   */
      debugf4("%s() set name of kobject to: %s\n", __func__, edac_dev->name);
      err = kobject_set_name(&edac_dev->kobj, "%s", edac_dev->name);
      if (err)
            goto err_out;

      /* Record which module 'owns' this control structure
       * and bump the ref count of the module
       */
      edac_dev->owner = THIS_MODULE;

      if (!try_module_get(edac_dev->owner)) {
            err = -ENODEV;
            goto err_out;
      }

      /* register */
      err = kobject_register(&edac_dev->kobj);
      if (err) {
            debugf1("%s()Failed to register '.../edac/%s'\n",
                  __func__, edac_dev->name);
            goto err_kobj_reg;
      }

      /* At this point, to 'free' the control struct,
       * edac_device_unregister_sysfs_main_kobj() must be used
       */

      debugf4("%s() Registered '.../edac/%s' kobject\n",
            __func__, edac_dev->name);

      return 0;

      /* Error exit stack */
err_kobj_reg:
      module_put(edac_dev->owner);

err_out:
      return err;
}

/*
 * edac_device_unregister_sysfs_main_kobj:
 *    the '..../edac/<name>' kobject
 */
void edac_device_unregister_sysfs_main_kobj(
                              struct edac_device_ctl_info *edac_dev)
{
      debugf0("%s()\n", __func__);
      debugf4("%s() name of kobject is: %s\n",
            __func__, kobject_name(&edac_dev->kobj));

      /*
       * Unregister the edac device's kobject and
       * allow for reference count to reach 0 at which point
       * the callback will be called to:
       *   a) module_put() this module
       *   b) 'kfree' the memory
       */
      kobject_unregister(&edac_dev->kobj);
}

/* edac_dev -> instance information */

/*
 * Set of low-level instance attribute show functions
 */
static ssize_t instance_ue_count_show(struct edac_device_instance *instance,
                        char *data)
{
      return sprintf(data, "%u\n", instance->counters.ue_count);
}

static ssize_t instance_ce_count_show(struct edac_device_instance *instance,
                        char *data)
{
      return sprintf(data, "%u\n", instance->counters.ce_count);
}

#define to_instance(k) container_of(k, struct edac_device_instance, kobj)
#define to_instance_attr(a) container_of(a,struct instance_attribute,attr)

/* DEVICE instance kobject release() function */
static void edac_device_ctrl_instance_release(struct kobject *kobj)
{
      struct edac_device_instance *instance;

      debugf1("%s()\n", __func__);

      /* map from this kobj to the main control struct
       * and then dec the main kobj count
       */
      instance = to_instance(kobj);
      kobject_put(&instance->ctl->kobj);
}

/* instance specific attribute structure */
struct instance_attribute {
      struct attribute attr;
      ssize_t(*show) (struct edac_device_instance *, char *);
      ssize_t(*store) (struct edac_device_instance *, const char *, size_t);
};

/* Function to 'show' fields from the edac_dev 'instance' structure */
static ssize_t edac_dev_instance_show(struct kobject *kobj,
                        struct attribute *attr, char *buffer)
{
      struct edac_device_instance *instance = to_instance(kobj);
      struct instance_attribute *instance_attr = to_instance_attr(attr);

      if (instance_attr->show)
            return instance_attr->show(instance, buffer);
      return -EIO;
}

/* Function to 'store' fields into the edac_dev 'instance' structure */
static ssize_t edac_dev_instance_store(struct kobject *kobj,
                        struct attribute *attr,
                        const char *buffer, size_t count)
{
      struct edac_device_instance *instance = to_instance(kobj);
      struct instance_attribute *instance_attr = to_instance_attr(attr);

      if (instance_attr->store)
            return instance_attr->store(instance, buffer, count);
      return -EIO;
}

/* edac_dev file operations for an 'instance' */
static struct sysfs_ops device_instance_ops = {
      .show = edac_dev_instance_show,
      .store = edac_dev_instance_store
};

#define INSTANCE_ATTR(_name,_mode,_show,_store)        \
static struct instance_attribute attr_instance_##_name = {      \
      .attr = {.name = __stringify(_name), .mode = _mode },   \
      .show   = _show,                                        \
      .store  = _store,                                       \
};

/*
 * Define attributes visible for the edac_device instance object
 *    Each contains a pointer to a show and an optional set
 *    function pointer that does the low level output/input
 */
INSTANCE_ATTR(ce_count, S_IRUGO, instance_ce_count_show, NULL);
INSTANCE_ATTR(ue_count, S_IRUGO, instance_ue_count_show, NULL);

/* list of edac_dev 'instance' attributes */
static struct instance_attribute *device_instance_attr[] = {
      &attr_instance_ce_count,
      &attr_instance_ue_count,
      NULL,
};

/* The 'ktype' for each edac_dev 'instance' */
static struct kobj_type ktype_instance_ctrl = {
      .release = edac_device_ctrl_instance_release,
      .sysfs_ops = &device_instance_ops,
      .default_attrs = (struct attribute **)device_instance_attr,
};

/* edac_dev -> instance -> block information */

#define to_block(k) container_of(k, struct edac_device_block, kobj)
#define to_block_attr(a) \
      container_of(a, struct edac_dev_sysfs_block_attribute, attr)

/*
 * Set of low-level block attribute show functions
 */
static ssize_t block_ue_count_show(struct kobject *kobj,
                              struct attribute *attr, char *data)
{
      struct edac_device_block *block = to_block(kobj);

      return sprintf(data, "%u\n", block->counters.ue_count);
}

static ssize_t block_ce_count_show(struct kobject *kobj,
                              struct attribute *attr, char *data)
{
      struct edac_device_block *block = to_block(kobj);

      return sprintf(data, "%u\n", block->counters.ce_count);
}

/* DEVICE block kobject release() function */
static void edac_device_ctrl_block_release(struct kobject *kobj)
{
      struct edac_device_block *block;

      debugf1("%s()\n", __func__);

      /* get the container of the kobj */
      block = to_block(kobj);

      /* map from 'block kobj' to 'block->instance->controller->main_kobj'
       * now 'release' the block kobject
       */
      kobject_put(&block->instance->ctl->kobj);
}


/* Function to 'show' fields from the edac_dev 'block' structure */
static ssize_t edac_dev_block_show(struct kobject *kobj,
                        struct attribute *attr, char *buffer)
{
      struct edac_dev_sysfs_block_attribute *block_attr =
                                    to_block_attr(attr);

      if (block_attr->show)
            return block_attr->show(kobj, attr, buffer);
      return -EIO;
}

/* Function to 'store' fields into the edac_dev 'block' structure */
static ssize_t edac_dev_block_store(struct kobject *kobj,
                        struct attribute *attr,
                        const char *buffer, size_t count)
{
      struct edac_dev_sysfs_block_attribute *block_attr;

      block_attr = to_block_attr(attr);

      if (block_attr->store)
            return block_attr->store(kobj, attr, buffer, count);
      return -EIO;
}

/* edac_dev file operations for a 'block' */
static struct sysfs_ops device_block_ops = {
      .show = edac_dev_block_show,
      .store = edac_dev_block_store
};

#define BLOCK_ATTR(_name,_mode,_show,_store)        \
static struct edac_dev_sysfs_block_attribute attr_block_##_name = {     \
      .attr = {.name = __stringify(_name), .mode = _mode },   \
      .show   = _show,                                        \
      .store  = _store,                                       \
};

BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL);
BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL);

/* list of edac_dev 'block' attributes */
static struct edac_dev_sysfs_block_attribute *device_block_attr[] = {
      &attr_block_ce_count,
      &attr_block_ue_count,
      NULL,
};

/* The 'ktype' for each edac_dev 'block' */
static struct kobj_type ktype_block_ctrl = {
      .release = edac_device_ctrl_block_release,
      .sysfs_ops = &device_block_ops,
      .default_attrs = (struct attribute **)device_block_attr,
};

/* block ctor/dtor  code */

/*
 * edac_device_create_block
 */
static int edac_device_create_block(struct edac_device_ctl_info *edac_dev,
                        struct edac_device_instance *instance,
                        struct edac_device_block *block)
{
      int i;
      int err;
      struct edac_dev_sysfs_block_attribute *sysfs_attrib;
      struct kobject *main_kobj;

      debugf4("%s() Instance '%s' inst_p=%p  block '%s'  block_p=%p\n",
            __func__, instance->name, instance, block->name, block);
      debugf4("%s() block kobj=%p  block kobj->parent=%p\n",
            __func__, &block->kobj, &block->kobj.parent);

      /* init this block's kobject */
      memset(&block->kobj, 0, sizeof(struct kobject));
      block->kobj.parent = &instance->kobj;
      block->kobj.ktype = &ktype_block_ctrl;

      err = kobject_set_name(&block->kobj, "%s", block->name);
      if (err)
            return err;

      /* bump the main kobject's reference count for this controller
       * and this instance is dependant on the main
       */
      main_kobj = kobject_get(&edac_dev->kobj);
      if (!main_kobj) {
            err = -ENODEV;
            goto err_out;
      }

      /* Add this block's kobject */
      err = kobject_register(&block->kobj);
      if (err) {
            debugf1("%s() Failed to register instance '%s'\n",
                  __func__, block->name);
            kobject_put(main_kobj);
            err = -ENODEV;
            goto err_out;
      }

      /* If there are driver level block attributes, then added them
       * to the block kobject
       */
      sysfs_attrib = block->block_attributes;
      if (sysfs_attrib && block->nr_attribs) {
            for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {

                  debugf4("%s() creating block attrib='%s' "
                        "attrib->%p to kobj=%p\n",
                        __func__,
                        sysfs_attrib->attr.name,
                        sysfs_attrib, &block->kobj);

                  /* Create each block_attribute file */
                  err = sysfs_create_file(&block->kobj,
                        &sysfs_attrib->attr);
                  if (err)
                        goto err_on_attrib;
            }
      }

      return 0;

      /* Error unwind stack */
err_on_attrib:
      kobject_unregister(&block->kobj);

err_out:
      return err;
}

/*
 * edac_device_delete_block(edac_dev,block);
 */
static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,
                        struct edac_device_block *block)
{
      struct edac_dev_sysfs_block_attribute *sysfs_attrib;
      int i;

      /* if this block has 'attributes' then we need to iterate over the list
       * and 'remove' the attributes on this block
       */
      sysfs_attrib = block->block_attributes;
      if (sysfs_attrib && block->nr_attribs) {
            for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {

                  /* remove each block_attrib file */
                  sysfs_remove_file(&block->kobj,
                        (struct attribute *) sysfs_attrib);
            }
      }

      /* unregister this block's kobject, SEE:
       *    edac_device_ctrl_block_release() callback operation
       */
      kobject_unregister(&block->kobj);
}

/* instance ctor/dtor code */

/*
 * edac_device_create_instance
 *    create just one instance of an edac_device 'instance'
 */
static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
                        int idx)
{
      int i, j;
      int err;
      struct edac_device_instance *instance;
      struct kobject *main_kobj;

      instance = &edac_dev->instances[idx];

      /* Init the instance's kobject */
      memset(&instance->kobj, 0, sizeof(struct kobject));

      /* set this new device under the edac_device main kobject */
      instance->kobj.parent = &edac_dev->kobj;
      instance->kobj.ktype = &ktype_instance_ctrl;
      instance->ctl = edac_dev;

      err = kobject_set_name(&instance->kobj, "%s", instance->name);
      if (err)
            goto err_out;

      /* bump the main kobject's reference count for this controller
       * and this instance is dependant on the main
       */
      main_kobj = kobject_get(&edac_dev->kobj);
      if (!main_kobj) {
            err = -ENODEV;
            goto err_out;
      }

      /* Formally register this instance's kobject */
      err = kobject_register(&instance->kobj);
      if (err != 0) {
            debugf2("%s() Failed to register instance '%s'\n",
                  __func__, instance->name);
            kobject_put(main_kobj);
            goto err_out;
      }

      debugf4("%s() now register '%d' blocks for instance %d\n",
            __func__, instance->nr_blocks, idx);

      /* register all blocks of this instance */
      for (i = 0; i < instance->nr_blocks; i++) {
            err = edac_device_create_block(edac_dev, instance,
                                    &instance->blocks[i]);
            if (err) {
                  /* If any fail, remove all previous ones */
                  for (j = 0; j < i; j++)
                        edac_device_delete_block(edac_dev,
                                          &instance->blocks[j]);
                  goto err_release_instance_kobj;
            }
      }

      debugf4("%s() Registered instance %d '%s' kobject\n",
            __func__, idx, instance->name);

      return 0;

      /* error unwind stack */
err_release_instance_kobj:
      kobject_unregister(&instance->kobj);

err_out:
      return err;
}

/*
 * edac_device_remove_instance
 *    remove an edac_device instance
 */
static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev,
                              int idx)
{
      struct edac_device_instance *instance;
      int i;

      instance = &edac_dev->instances[idx];

      /* unregister all blocks in this instance */
      for (i = 0; i < instance->nr_blocks; i++)
            edac_device_delete_block(edac_dev, &instance->blocks[i]);

      /* unregister this instance's kobject, SEE:
       *    edac_device_ctrl_instance_release() for callback operation
       */
      kobject_unregister(&instance->kobj);
}

/*
 * edac_device_create_instances
 *    create the first level of 'instances' for this device
 *    (ie  'cache' might have 'cache0', 'cache1', 'cache2', etc
 */
static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
{
      int i, j;
      int err;

      debugf0("%s()\n", __func__);

      /* iterate over creation of the instances */
      for (i = 0; i < edac_dev->nr_instances; i++) {
            err = edac_device_create_instance(edac_dev, i);
            if (err) {
                  /* unwind previous instances on error */
                  for (j = 0; j < i; j++)
                        edac_device_delete_instance(edac_dev, j);
                  return err;
            }
      }

      return 0;
}

/*
 * edac_device_delete_instances(edac_dev);
 *    unregister all the kobjects of the instances
 */
static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
{
      int i;

      /* iterate over creation of the instances */
      for (i = 0; i < edac_dev->nr_instances; i++)
            edac_device_delete_instance(edac_dev, i);
}

/* edac_dev sysfs ctor/dtor  code */

/*
 * edac_device_add_main_sysfs_attributes
 *    add some attributes to this instance's main kobject
 */
static int edac_device_add_main_sysfs_attributes(
                  struct edac_device_ctl_info *edac_dev)
{
      struct edac_dev_sysfs_attribute *sysfs_attrib;
      int err = 0;

      sysfs_attrib = edac_dev->sysfs_attributes;
      if (sysfs_attrib) {
            /* iterate over the array and create an attribute for each
             * entry in the list
             */
            while (sysfs_attrib->attr.name != NULL) {
                  err = sysfs_create_file(&edac_dev->kobj,
                        (struct attribute*) sysfs_attrib);
                  if (err)
                        goto err_out;

                  sysfs_attrib++;
            }
      }

err_out:
      return err;
}

/*
 * edac_device_remove_main_sysfs_attributes
 *    remove any attributes to this instance's main kobject
 */
static void edac_device_remove_main_sysfs_attributes(
                  struct edac_device_ctl_info *edac_dev)
{
      struct edac_dev_sysfs_attribute *sysfs_attrib;

      /* if there are main attributes, defined, remove them. First,
       * point to the start of the array and iterate over it
       * removing each attribute listed from this device's instance's kobject
       */
      sysfs_attrib = edac_dev->sysfs_attributes;
      if (sysfs_attrib) {
            while (sysfs_attrib->attr.name != NULL) {
                  sysfs_remove_file(&edac_dev->kobj,
                              (struct attribute *) sysfs_attrib);
                  sysfs_attrib++;
            }
      }
}

/*
 * edac_device_create_sysfs() Constructor
 *
 * accept a created edac_device control structure
 * and 'export' it to sysfs. The 'main' kobj should already have been
 * created. 'instance' and 'block' kobjects should be registered
 * along with any 'block' attributes from the low driver. In addition,
 * the main attributes (if any) are connected to the main kobject of
 * the control structure.
 *
 * Return:
 *    0     Success
 *    !0    Failure
 */
int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev)
{
      int err;
      struct kobject *edac_kobj = &edac_dev->kobj;

      debugf0("%s() idx=%d\n", __func__, edac_dev->dev_idx);

      /*  go create any main attributes callers wants */
      err = edac_device_add_main_sysfs_attributes(edac_dev);
      if (err) {
            debugf0("%s() failed to add sysfs attribs\n", __func__);
            goto err_out;
      }

      /* create a symlink from the edac device
       * to the platform 'device' being used for this
       */
      err = sysfs_create_link(edac_kobj,
                        &edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK);
      if (err) {
            debugf0("%s() sysfs_create_link() returned err= %d\n",
                  __func__, err);
            goto err_remove_main_attribs;
      }

      /* Create the first level instance directories
       * In turn, the nested blocks beneath the instances will
       * be registered as well
       */
      err = edac_device_create_instances(edac_dev);
      if (err) {
            debugf0("%s() edac_device_create_instances() "
                  "returned err= %d\n", __func__, err);
            goto err_remove_link;
      }


      debugf4("%s() create-instances done, idx=%d\n",
            __func__, edac_dev->dev_idx);

      return 0;

      /* Error unwind stack */
err_remove_link:
      /* remove the sym link */
      sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);

err_remove_main_attribs:
      edac_device_remove_main_sysfs_attributes(edac_dev);

err_out:
      return err;
}

/*
 * edac_device_remove_sysfs() destructor
 *
 * given an edac_device struct, tear down the kobject resources
 */
void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev)
{
      debugf0("%s()\n", __func__);

      /* remove any main attributes for this device */
      edac_device_remove_main_sysfs_attributes(edac_dev);

      /* remove the device sym link */
      sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);

      /* walk the instance/block kobject tree, deconstructing it */
      edac_device_delete_instances(edac_dev);
}

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